For your first game jam congrats on completing it! (and in only 10 hours nonetheless) Believe it or not the vast majority of people who enter game jams don't finish, let alone have something playable. So congrats on that and hopefully you learned a few things.
For some constructive feedback, the music was a bit too crazy for me, and some of the mechanics felt a bit off (I don't think it's possible to collect the heart in the middle of the level), but considering you did all this in only 10 hours I'm sure you'd have been able to iron out all those wrinkles if given more time.